Cloth scrubbing stone

I want to install a 24 x 18-inch basalt stone in our bathroom for washing clothes. However, the quoted price of 3,200 seems a bit expensive. I am thinking of using pata-varvanta for washing clothes. That will be much cheaper. I have seen people selling pata-varvanta and khal-batta (mortar and pestle) by the roadside. If anyone has seen them, please share the location.